WSDOT Projects

The existing SR 904 within the RDP limits is a two lane facility, providing 12 foot lanes and 4-9 foot shoulders. The right-of-way widths typically range from 40 feet to 125 feet from centerline.

Within the RDP limits along SR 904, approximately 17 percent of the northbound and 21 percent of the southbound is designated as no-passing zones at the following locations:

Table 2

Source: Construction Plans 2003

Table 3

Source: Construction Plans 2003

Table 4

Source: Construction Plans 2003

Horizontal and Vertical Alignments

The segment of SR 904 corridor addressed in this RDP is located along level terrain. The current posted speed limit is 55 mph. The speed for evaluating design elements on this section is 55 mph.

Sight distance is a critical factor in designing highways. Sight distance is measured in the following ways; stopping sight distance (SSD), decision sight distance, and passing sight distance. Stopping sight distance is the distance required to safely stop a vehicle traveling at design speed. Decision sight distance is the distance required for a driver to detect an unexpected condition, determine an appropriate maneuver and perform that maneuver. Passing sight distance is the distance required for a vehicle on a two-lane highway to perform a normal passing maneuver consistent with the highway’s design speed. Design SSD is utilized for new construction or reconstruction. Existing SSD is used when the vertical and horizontal alignments are unchanged and the sight obstruction is existing.

Table 5
Source: WSDOT Design Manual Supplement October 2002

* Rural stop maneuver/ Rural speed/path/direction change maneuvers

Source: Approved Right of Way Plans, WSDOT TRIPS System, Horizontal and Vertical Alignment Report

(1) Algebraic difference is positive for a sag curve and negative for a crest curve. (2) Approximate curve location and length from TRIPS System

Vertical curve has design speed less than posted speed.

There are various aerial and buried utilities located on this segment of the SR 904 corridor. During the construction of the endorsed plan, these utilities may incur temporary impacts.

The following are WSDOT recorded utilities:

• CenturyTel, Inc.

• Avista Corp.

• City of Cheney-Lighting

• US West Communications

Aerial Utilities

• • • •

Washington Water Power
Davis Communications Co.
Qwest Corp.
Four Lakes Water District

The following table provides a list of existing aerial utilities which are either a utility franchise or a utility permit along the corridor limits:

Table 8

Source: WSDOT Eastern Region Utilities (12/13/02) *Location unknown, for further details contact WSDOT Eastern Region Utilities.

The following table provides a list of existing buried utilities which are either a utility

franchise or utility permit within the RDP limits:

Table 9
Source: WSDOT Eastern Region Utilities (12/13/02)

The terrain of this segment of SR 904 is identified as level. Roadside character is classified from the roadways user’s visual perspective of the landscape. There are two categories of roadside character: natural (forest, open) and built (rural, semi-urban, urban). Natural character refers to a landscape in which vegetation and landforms are predominant. Natural character includes forest and open classifications. Built refers to landscape in which human elements and structures are notable or predominant in the overall context. Built character includes rural, semi-urban, and urban classifications. This segment of SR 904 is described as Rural.